Walt Disney World's strong recommendation for mobility
or stamina issues is to rent a wheelchair or
ECV. There are rarely places to sit while waiting for the attractions. There are a very few benches in the waiting areas for a very few of the shows. They can't provide you with what doesn't exist.
Let's see... places where you may be able to sit and wait for the ride or attraction:
There's a bench or two outside Carousel of Progress
There are some benches in the waiting area for Hall of Presidents
There may be some benches in the preshow area for Country Bear Jamboree
There may be some benches in the preshow area of Mickey's PhilharMagic
Nowhere to sit and wait: Space Mountain, Buzz Lightyear, Tomorrowland Transit Authority (line moves quickly), Cinderella's Golden Carroussel, Mad Hatter's TeaCups, Winnie the Pooh, Snow White, Peter Pan, Small World, Haunted Mansion, Liberty Belle, Splash Mountain, Big Thunder Mountain, Pirates of the Caribbean, Tiki Birds, Aladdin, Jungle Cruise.
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There's a bench to wait for wheelchair access at Spaceship Earth.
There's one or two benches in Ellen's Energy Adventure.
Plenty of benches to wait for the movie in China.
A few benches in the American Adventure
I don't recall France or Canada
Nowhere to sit and wait for Test Track, Mission: Space, the 3D movie in the Imagination Pavilion, Journey into Imagination (seldom busy), Circle of Life, Living with the Land, Soarin' (1/4 mile from entrance to boarding), Nemo, Turtle Talk with Crush, Three Caballeros, the boat ride in Norway (name escaping me at the moment).
The China and Canada movies are in the round, NO seats in the theaters.
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Nowhere to sit and wait at any of the Animal Kingdom attractions, from what I remember - disclaimer: I'm really tired and may be forgetting something, but the attraction lines move constantly, and I don't remember any seating while waiting for the shows, either. Just lines.
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Nowhere to sit and wait for Little Mermaid, Tower of Terror, Rock 'N Roller Coaster, Toy Story Midway Mania, Backstage Tour, Lights! Motors! Action!, Star Tours, Indiana Jones, American Idol, Sounds Dangerous (no need - never busy, if it's even still open), Great Movie Ride. There are or may be benches in the self-guided One Man's Dream, and the semi-self-guided(?) Animation Tour.